Thank you all for the valuable support given through this site.
I have some problem with my network now.
I had a network of 12 PCs with one Windows NT server and 11 win98 clients. Recently i upgraded my client PCs and installed windows XP in all of them. My sever is windows NT itself. But after upgradation i found a degradation in the performance of my client PCs. My Clients are communicating very slowly across the network. I have a designed software running in my network. The database of the software is in My server. This software also became damn slow. The problem started after upgrading win98 to XP. I installed NETBIOS protocol also. Can anybody give a reason for this degradation in performance?.